We’ve said it before, and we’ll say it again: Food holidays are jive. But when those made-up rites pay tribute to something as near and dear to us as pretzels, we can’t help but fall in line with the observance. And with today’s fake holiday, National Pretzel Day, the 100-plus Philly Pretzel Factory locations in the region are offering every person who enters one free pretzel. All day. And in addition to today’s freebies, the first 100 guests to come in will also be treated to one free pretzel a day throughout the entire month of May.